The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is

Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

Percentage of drum submerged in the slurry in case of rotary drum filter is

Trommels are revolving screens which normally operate in the range of __________ rpm.

Which of the following screens has the maximum capacity ?

Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

The opening of amesh screen (Taylor series) is

Ribbon blenders are exclusively meant for

Mixing of plastic solids is generally facilitated by

For a cyclone of diameter 0.2 m with a tangential velocity ofm/s at the wall, the separation factor is

Wet grinding in a revolving mill __________ as compared to dry grinding.

Filtration should be stopped in a filter press, if the

Which of the following clay mixing devices is vacuum operated for deairation of clay?

Screen efficiency is

Removal of activated carbon from glycerine is done by

In case of a hammer crusher, the final product size depends on the

__________ mill is normally used for grinding of talc.

Vacuum filter is most suitable for the

Which of the following is not accomplished by agitation of liquids in agitators?

The optimum moisture content in solids to be crushed/ground ranges from __________ percent.

Raw materials are charged in the iron blast furnace using

With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge

Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of

Filter medium resistance is that offered by the

The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be

Maximum size reduction in a fluid energy mill is achieved by

Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.

A gravity decanter is meant for the separation of two __________ density.

Which of the following minerals is not subjected to magnetic separation method?

In closed circuit grinding as compared to open circuit grinding, the

The mechanism of size reduction by a hammer mill is by impact and attrition between the

The grinding in a hammer crusher takes place due to the

A compressible cake has the

For coarse reduction of hard solids, use

In a size reduction crushing operation, feed size istomm. while the product size istomm. This is a case of the __________ crushing.

In froth floatation, chemical agent added to cause air adherence is called

For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a

Handling of ashes and similar materials can be done best by a __________ conveyor.

Colloidal mills are used for __________ grinding.

The porosity of a compressible cake is

Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation ?

If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the

Pick out the wrong statement.

For efficient grinding, ball mills must be operated

The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.

Which of the following is not a revolving/tumbling mill used for size reduction?

The inlet pressure in a constant rate filtration

Pick out the correct statement.

A propeller agitator

Use of grinding aids results in the